Calculates the raw, dimensionless zoom factor from a ScaledZoom value.
ScaledZoom represents the distance in currentScope units that a single
logical screen pixel covers on the drawing plane.
This function is the inverse of getScaledZoomValueForScope.
Calculates the raw, dimensionless zoom factor from a
ScaledZoomvalue.ScaledZoomrepresents the distance incurrentScopeunits that a single logical screen pixel covers on the drawing plane. This function is the inverse ofgetScaledZoomValueForScope.